We know that hydraulic extrusion cracked coal bed of working-face, advanced the maximum main stress zone,improved the width of flaw zone,lowing the fatalness of coal outbrusting.

• 通过对3246风巷高压注水试验,水力挤出使工作面前方的煤体压裂,集中应力区向前推移,卸压带宽度增加,降低了煤的突出危险性,起到了消突作用。